Smart Dispenser

1// Include the library code
2// 
3
4#include <LiquidCrystal_I2C.h>  // Downloaded library to manage the lcd with I2C
5#include <Wire.h> // This library  allows Arduino to communicate with I2C devices
6LiquidCrystal_I2C lcd(0x27, 16,  2); //Create the object lcd with lcd_Addr 0x27 (0x3F)
7
8
9// Sensor pins
10
11#define  sensorPower 7
12#define sensorPin A1
13#define trigPin 9
14#define echoPin 10
15#define  pump_switch 3
16
17// Value for storing variables
18int waterval = 0;
19int  ml = 0;
20long ultra_duration;
21int ultra_distance;
22
23void setup() {
24  Serial.begin(9600);
25  
26  pinMode(sensorPower, OUTPUT); // Set D7 as an OUTPUT
27  pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
28  pinMode(echoPin,  INPUT); // Sets the echoPin as an Input
29  pinMode(pump_switch,OUTPUT); // Sets  the pumpswitch as an Output
30  
31  // Set to LOW so no power flows through the  sensor
32  digitalWrite(sensorPower, LOW);
33  digitalWrite(pump_switch, LOW);  //safety speed reset of the motor
34
35  startlcd(); // Print constant text
36}
37
38void  loop() {
39  // put your main code here, to run repeatedly:
40  int sensorValue  = analogRead(A0); //read the input on analog pin 0
41   
42  //get the reading  from the function below and print it
43  int level = readWaterSensor();
44  int  days = sensorValue/16.7;
45  int presence = readUltraSensor();
46  
47  Serial.print("Water  level:");
48  Serial.println(level); //print out the value you read
49  
50  lcd.setCursor(6, 1); 
51  lcd.print(days); // print  days on lcd 
52  lcd.setCursor(13,  3); 
53  lcd.print(level); // print water level variable on lcd
54
55  if (presence  <= 5) {
56    lcd.setCursor(6, 2); 
57    lcd.print("PUMP ON "); // print  water  level
58    digitalWrite(pump_switch, HIGH);  // Turn the switch ON 
59  }
60
61  else {
62    lcd.setCursor(6, 2); 
63    lcd.print("PUMP OFF"); // print  water  level
64    digitalWrite(pump_switch, LOW);   // Turn the switch OFF
65  }
66  
67  delay(200); //delay in between reads for stability
68
69}
70
71//This  is a function used to get the reading
72int readWaterSensor() {
73  digitalWrite(sensorPower,  HIGH);  // Turn the sensor ON
74  delay(10);              // wait 10 milliseconds
75  waterval = analogRead(sensorPin); // Read the analog value form sensor
76  waterval  = waterval/2.2;
77  digitalWrite(sensorPower, LOW); // Turn the sensor OFF
78  return waterval;  // send current reading
79}
80
81int readUltraSensor() {
82  // Clears the trigPin
83  digitalWrite(trigPin, LOW);
84  delayMicroseconds(2);
85  // Sets the trigPin on HIGH state for 10 micro seconds
86  digitalWrite(trigPin,  HIGH);
87  delayMicroseconds(10);
88  digitalWrite(trigPin, LOW);
89  // Reads  the echoPin, returns the sound wave travel time in microseconds
90  ultra_duration  = pulseIn(echoPin, HIGH);
91  // Calculating the distance
92  ultra_distance=  ultra_duration*0.034/2;
93
94  return ultra_distance;
95}
96
97void startlcd()  {
98  lcd.init(); // Initiate LCD
99  lcd.backlight(); // Turn on backlight
100  lcd.begin(20, 4); // set up the LCD's number of columns and rows:  
101  lcd.setCursor(4,  0); // set the cursor to column 4, line 2 
102  lcd.print("INSERT TIME"); // Print  a message to the LCD.
103  lcd.setCursor(8, 1); 
104  lcd.print(" DAYS");
105  lcd.setCursor(0, 3); 
106  lcd.print("Water Level:");
107  lcd.setCursor(17,  3); 
108  lcd.print("ml"); // print  water level
109}
110